To
ensure the highest accuracy and precision of our measurement, our
equipment is complied with the requirements of accuracy classes 0 or 1
defined in IEC 651 and IEC 804.

聲壓級測量設備的準確度滿足IEC
651 和IEC 804中規定的0型或1型准確度要求。

Equipment

Fulfilled
International Standard

Real-
Time Frequency Analyzer

Yes

Free-
field Microphone

Yes

Microphone
Preamplifier

Yes

Sound
Level Calibrator

Yes

OmniPower
Sound Source

Yes

Test
Arrangement 測試安排

A
band of random noise is used as a test signal and turned on long
enough for the sound pressure level in the room to reach a steady
state.

When
the signal is turn off, the sound pressure level will decrease and
the rate of decay may be determined from measurements of the
average time for the sound pressure level in a specified frequency
band to decay through a certain range.

Repeat
the measurement under Empty room and With specimen inside the
reverberation chamber condition. Calculate the sound absorption
coefficient of the test specimen based in the variation of
reverberation time.

Average
of the sound absorption coefficients of a material for 4 octave
bands: 250 Hz, 500 Hz, 1000 Hz and 2000 Hz, inclusive.

Sound
Absorption Average (SAA)

Average
of the sound absorption coefficients of a material for 12 1/3
octave bands from 200 Hz through 2500 Hz, inclusive.

Certify
Your Buildings Specimen 為產品認證

Once
finished laboratory measurement, a detail report of the measurement, and a
Certification that certified the Weighted Sound Absorption Coefficient (aw
/ DLa),
Noise
Reduction Coefficient (NRC) or Sound Absorption Average (SAA)
the of the tested buildings specimen will be issued. People can refer to
this Certification to consult the acoustics performance of your building
products. No more estimation, true data is here.